Harmony Blockchain Data Indexing API

Harmony Quick Facts

Harmony is an open and fast blockchain. The production mainnet supports 4 shards of 1000 nodes, capable of running Ethereum applications with 2-second transaction finality, and 1000 times lower fees than Ethereum. Harmony is your open platform for assets, collectibles, identity, governance. The secure bridges offer cross-chain asset transfers with Ethereum, Binance and 3 other chains. Harmony’s Effective Proof-of-Stake (EPoS) reduces centralization while supporting stake delegation, reward compounding and double-sign slashing. Harmony aims to build an open network of nodes operated and governed by a large community. This node community is called Pangaea.

  1. Mainnet
  2. Harmony Testnet
Chain nameharmony-mainnet
Chain ID1666600000
Block explorerhttps://explorer.harmony.one/
Blocktime2 seconds
Historical balances
NFT assets and metadata
Premium Endpoints
Premium Balances
Premium Transactions
Premium Log Events
Query via SQL on Increment

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Network Status

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Monthly Active Wallets
Unique wallets who transact on a monthly basis.
Unique transactions on a monthly basis.
Active Tokens
Unique tokens active on a monthly basis.
Powered by Increment.

Code Samples

  1. Token Balances
  2. Transactions
  3. Portfolio
  4. Get a block

Get token balances for address


Commonly used to fetch the native, fungible (ERC20), and non-fungible (ERC721 & ERC1155) tokens held by an address. Response includes spot prices and other metadata.

Each API Call Currently Costs: 1.00 Credits.

Show Premium Supported Chains
Show Guides
  1. shell
  2. JavaScript
  3. ruby
  4. python
curl -X GET https://api.covalenthq.com/v1/{chainName}/address/{walletAddress}/balances_v2/ \
    -H 'Content-Type: application/json' \
    -u YOUR_API_KEY: \
     # The colon prevents curl from asking for a password